Most likely scenario is seller cannot readily sell and is overpriced. Upon policy maturity, the seller is getting the two mil. That number is set. But only God knows the time.
I recall hearing a radio program (NPR?) where terminally ill people were selling their life insurance policies for a (reduced, balloon) payment, up front to brokers, while the person was still alive.
From what I recall, things were on the up and up contractually, but the sellers (and their previous beneficiaries) cried foul when all was said and done. Predictably, lawyers got involved.